JP2741307B2 - Thermo-responsive steam trap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap for automatically discharging condensate generated in various steam-using equipment and steam pipes, and more particularly to a steam trap which is heated and cooled by steam and condensate and expands in accordance with the temperature. The present invention relates to a thermo-responsive steam trap for discharging condensate below a desired temperature out of the system by using a temperature control element containing a contracting medium.

[0002]

2. Description of the Related Art A conventional heat-responsive steam trap will be described with reference to Japanese Patent Publication No. 60-46318. In this method, an inlet, a valve chamber, and an outlet are formed by valve casing, a valve seat member that forms an outlet path between the valve chamber and the outlet is disposed, and an outer space is provided between the two wall members and both wall members. A temperature control element composed of a diaphragm having a fixed peripheral edge and an expansion medium sealed between one of the wall members and the diaphragm was disposed in the valve chamber, and was fixed to the outlet side of the diaphragm by displacement of the diaphragm due to expansion and contraction of the expansion medium. The valve member is driven to open and close the outlet path.

[0003] When high-temperature steam flows into the valve chamber, the expansion medium expands and the valve member is seated on the valve seat member, the outlet path is closed to prevent discharge of steam, and low-temperature condensate is condensed. When it flows in, the expansion medium contracts, causing the valve member to move away from the valve seat member, opening the lead-out path, and discharging out of the system.

[0004]

According to the above, when the temperature control element is broken and the expansion medium flows out, the valve member is seated on the valve seat member by the fluid pressure on the inlet side, and the outlet path is closed. . If the valve is closed when the temperature control element is broken in this way, the condensate cannot be discharged, so the operating efficiency of the equipment using steam will be reduced, defective products will be generated, and water hammer will occur. And the problem of damaging the piping.

Accordingly, it is an object of the present invention to enable the valve member to open when the temperature control element is broken.

[0006]

In order to solve the above-mentioned technical problem, the technical means of the present invention is to form an inlet, a valve chamber, and an outlet by valve casing, and to form an inlet, a valve chamber, and an outlet between the valve chamber and the outlet. Temperature control comprising a diaphragm having an outer peripheral edge fixed between two wall members and both wall members, and an expansion medium sealed between the one wall member and the diaphragm. In a thermo-responsive steam trap that opens and closes a lead-out path by driving a valve member disposed on the lead-out path side of the diaphragm by displacing the diaphragm due to expansion and contraction of the expansion medium, the element is disposed in the valve chamber. The outer peripheral surface of the valve member is slidably guided in an airtight manner by the inner peripheral wall, and a through hole is formed in the valve member so as to communicate a surface of the diaphragm that is not in contact with the expansion medium and an outlet path.

[0007]

The operation of the above technical means is as follows.
When the temperature of the fluid flowing into the valve chamber from the inlet is high, the expansion medium expands and displaces the valve member toward the valve seat member via the diaphragm. As a result, the valve member closes the lead-out path to prevent the outflow of high-temperature fluid, that is, steam. On the other hand, when the low-temperature fluid flows, the expansion medium contracts, and the valve member is separated from the valve seat member by the fluid pressure. This opens the outlet path and discharges the low-temperature fluid to the outlet.

When the temperature control element is damaged, the space filled with the expansion medium communicates with the outlet through the outlet formed through the through hole formed in the valve member, so that the valve member is separated from the valve seat member by the fluid pressure on the inlet side. Sit down, open the outlet path and open the valve.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 to 3). The upper casing 1 and the lower casing 2 are fastened with bolts 3 to form a valve casing having a valve chamber 4 therein. The airtightness between the two casings 1 and 2 is maintained by an annular gasket 5. An inlet 6 is formed in the upper case 1 and an outlet 7 is formed in the lower case 2.

A valve seat member 9 is provided on a partition 8 between the valve chamber 4 and the outlet 7.
Screw connection. The airtightness between the partition 8 and the valve seat member 9 is maintained by an annular gasket 10. An outlet path 11 that connects the valve chamber 4 and the outlet 7 is formed at the center of the valve seat member 9.

A temperature control element comprising an upper wall member 12, a lower wall member 13, and a diaphragm 14 is arranged in the valve chamber 4. The temperature control element is attached by fixing the lower end of the lower wall member 13 to the annular groove on the upper surface of the valve seat member 9. The diaphragm 14 is sandwiched between the upper wall member 12 and the lower wall member 13, and the respective outer peripheral edges are fixed by welding (at the position of reference numeral 15). An expansion medium 16 is injected into a space formed by the upper wall member 12 and the diaphragm 14, and is sealed by welding (at a reference numeral 17). The expansion medium 16 is formed of water, a fluid having a lower boiling point than water, or a mixture thereof.
The lower wall member 12 has a plurality of windows 18 through which the fluid passes.

A valve member 19 that detaches from and seats on the valve seat member 9 to open and close the outlet passage 11 is disposed below the diaphragm 14.
The valve member 19 has a disk shape, and slides up and down while maintaining airtightness between the inner wall of the lower wall member 13 and a seal ring 20 disposed on the outer periphery thereof. The valve member 19 has a through hole 21 vertically penetrating at the center thereof, and communicates the lower surface of the diaphragm 14 and the lead-out path 11.

When the temperature of the fluid flowing into the valve chamber 4 from the inlet 6 is high, the expansion medium 16 expands and displaces the valve member 19 through the diaphragm 14. As a result, the valve member 19 is seated on the valve seat member 9 to close the lead-out path 11, and
Prevents outflow of hot fluid or steam. When the fluid temperature becomes lower than a predetermined value due to heat radiation or the like, the expansion medium 16 contracts. The valve member 19 is moved by the fluid pressure on the inlet 6 side to the valve seat member 9.
, The outlet path 11 is opened, and the low-temperature fluid, that is, low-temperature condensate is discharged from the outlet 7 to the outside of the system.

[0014]

The present invention has the following specific effects. As described above, in the present invention, since the valve member can be opened when the temperature control element is broken, the operating efficiency of the equipment using steam is reduced, defective products are produced, and water hammer is generated. Absent. Further, when the pressure on the outlet side is higher than that on the inlet side, the fluid on the outlet side flows between the diaphragm and the valve member through the through hole, displacing the diaphragm upward and displacing the valve member downward, The valve member is closed to prevent backflow.

[Brief description of the drawings]

FIG. 1 is a sectional view of a thermally responsive steam trap according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a valve-opened state of a valve member in FIG. 1;

FIG. 3 is an enlarged cross-sectional view showing a valve-closed state of a valve member of FIG. 1;

[Explanation of symbols]

 Reference Signs List 4 valve chamber 6 inlet 7 outlet 9 valve seat member 11 outlet path 12 upper wall member 13 lower wall member 14 diaphragm 16 expansion medium 19 valve member 20 seal ring 21 through hole

Claims (1)

(57) [Claims] An inlet, a valve chamber, and an outlet are formed by valve casing, and a valve seat member that forms an outlet passage between the valve chamber and the outlet is disposed, and between the two wall members and both wall members. A temperature control element composed of a diaphragm having an outer peripheral edge fixed thereto and an expansion medium sealed between the one wall member and the diaphragm is disposed in the valve chamber, and the diaphragm is displaced by the expansion and contraction of the expansion medium so as to be on the side from which the diaphragm is taken out. In the one that drives the disposed valve member to open and close the lead-out path, the inner peripheral wall of the other wall member guides the outer periphery of the valve member slidably in an airtight manner, and the surface that does not contact the expansion medium of the diaphragm with the valve member. A thermo-responsive steam trap formed with a through-hole communicating with the outlet path.